Originally posted by fyimo:
When you see a model with a dash and then a number the number is the engineering changes that occured so a 29-2 is the gun released with the second engineering change and the Model 29 no dash is the first version. The no dash 29 was a 4 screw and the 29-2 were a 3 screw model. The no dash 29 has a serial number staring with an S and the 29-2 serial numbers started with an N in 1969 and those made from 1962 to 1969 still had started with an S until S333454 when they switched to an N.
I'm sure that more 29 experts can clear up any mistakes I made.